Rotary shaft seal types
KC and KB seals: grease seals with a dust lip
A KC seal holds grease in where there is dust on the other side, with a springless lip and a dust lip; the KB is the same with a metal outside diameter. Conquest Seal supplies radial shaft seals, also sold as rotary shaft seals, rotary lip seals and oil seals, in inch and metric sizes. Send the part number or drawing and we quote it.
- Family
- Radial lip seals
- Designation
- KC
- Lips
- 2 (our reading)
- Dust lip
- Yes (our reading)
- Garter spring
- No (our reading)
- Outside diameter
- Rubber-covered
- Pressure
- Not for pressure: the maker states these types cannot be used where there is pressure
When to use it
Holding grease in where there is some dust on the other side. The grease duty of a V type with dirt on the outboard side.
When another type fits better
- VC: Grease and dust seal, rubber outside diameter, no spring, when the outboard side is clean.
Also covered on this page
- KB: Grease seal with dust lip, metal outside diameter. As KC, with a metal outside diameter. The bore needs the precise seat a metal outside diameter gives.
A designation match is not a fit, form and function match. These schemes measure different things, and the same letter means different things in different catalogs. Confirm the three dimensions, the lip material and the duty against the drawing before substituting any seal.
| Letter code | ISO 6194-1 | JIS B 2402 | JASO | DIN 3760/3761 form |
|---|---|---|---|---|
| KC | no equivalent | no equivalent | P | none on file (our reading) |
Sources: NOK® Oil Seals catalogue 014E, read 2026-09-16; Freudenberg Technical Manual for Simmerring® seals and rotary seals, read 2026-09-16; ISO 6194-1: Rotary shaft lip-type seals incorporating elastomeric sealing elements, Part 1: Nominal dimensions and tolerances, ISO 6194-1:2007, read 2026-09-27; JIS B 2402-1: Rotary shaft lip-type seals incorporating elastomeric sealing elements, Part 1: Nominal dimensions and tolerances, Japanese Standards Association, JIS B 2402-1:2013, read 2026-09-27.
NOK is a trademark of NOK Corporation; Simmerring is a trademark of Carl Freudenberg KG. The maker designations on this page are the makers' own. No affiliation or endorsement is implied.
Related pages
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the shaft, bore and width, or the old seal's markings
The three dimensions or the code printed on the old seal, the speed, any pressure, the fluid and the quantity. A Conquest representative replies with the quote.
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